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Several other users have also been experiencing problems with the get_domain_session URLs appearing and not redirecting. In all cases, they are using older, no longer supported site schemes such as XColibur and Dystopia. We can only recommend switching to one of the supported site schemes http://www.livejournal.com/manage/settings/?cat=display, followed by clearing your browser's cache and deleting your livejournal cookies.

Based on other reports we've seen, having F-Secure Internet Security 2012 antivirus software installed on your computer seems to cause this problem, although it could potentially be caused by other antivirus/firewall software falsely identifying a redirect as an attack.

...And that seems to have been the cause. I switched to Norton and everything works again. I had tried disabling my (F-Secure) antivir before but it didn't work, for some reason. Now it does. Thanks :)